Process for the production of C4 -C16 alkyl rubbers using the slurry process

Abstract

The production of C 4 -C 16 alkyl rubbers using the slurry process by copolymerisation of isoolefins having 4 to 16 carbon atoms with conjugated diolefins having 4 to 6 carbon atoms and/or cationically polymerisable, mono- or polyunsaturated organic compounds having 4 to 16 carbon atoms in the presence of methyl chloride and in the presence of Friedel-Crafts catalysts proceeds particularly advantageously by performing copolymerisation in the presence of linear, branched and/or cyclic alkanes.

We claim: 
     
       1. Process for the production of C 4  -C 16  alkyl rubbers using the slurry process by copolymerisation of isoolefins having 4 to 16 carbon atoms with conjugated diolefins having 4 to 6 carbon atoms and/or cationically polymerisable, mono- or polyunsaturated organic compounds having 4 to 16 carbon atoms in the presence of methyl chloride and in the presence of Friedel-Crafts catalysts at temperatures of -70° to -105° C. and at pressures of 1 to 10 bar, characterised in that copolymerisation is performed in the presence of 1 to 20 wt. %, relative to the continuous phase, of linear, branched and/or cyclic alkanes having 4 to 8 carbon atoms. 
     
     
       2. Process according to claim 1, characterised in that copolymerisation is performed in the presence of 3 to 13 wt. % of alkanes. 
     
     
       3. Process according to claim 1, characterised in that copolymerisation is performed in the presence of pentanes, hexanes, cyclohexane and/or heptanes. 
     
     
       4. Process according to claim 1, characterised in that copolymerisation is performed in the presence of iso-hexanes and/or n-hexanes.